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Finding the Fourth Proportional to 407.70, 611.28 and 286.74

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Solution

The fourth proportional to 407.70, 611.28 and 286.74 is: 429.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.70 : 611.28 = 286.74 : x
  2. Step 2: Convert to fraction form
    407.70/611.28 = 286.74/x
  3. Step 3: Cross multiply
    407.70x = 611.28 × 286.74
  4. Step 4: Simplify right side
    407.70x = 175,278.43
  5. Step 5: Solve for x
    x = 175,278.43/407.70
  6. Step 6: Final answer
    x = 429.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.